I would like to overplot a line to a slice of mine. I use the line callback, for example with the following sintax:
if I have well understood, the two pairs of numbers are pixel-based coordinates. I have a few questions:
1) where is the range of these number set (i.e., the image size in pixel), and how can I eventually modify it?
2) Is it any simple way to define the begin and end points of a line in other coordinates? Code coordinates from 0 to 1 would be enough;
3) How do I modify the features of the line (e.g. thickness, color)?
Thanks in advance,